144 0001882913 XXXXXXXX LIVE 0001866692 AMPLITUDE INC 001-40817 201 Third Street, Suite 200 San Francisco CA 94103 4152312353 ANNE LEE SKATES Director Officer 10% Stockholder COMMON Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

75000 870750.00 103610139 12/24/2025 NASDAQ Common 12/01/2021 Restricted Stock Awards Issuer N 75000 12/01/2021 N/A N 10b5-1 Sales for ANNE LEE SKATES

201 Third Street, Suite 200 San Francisco CA 94103

COMMON 11/11/2025 400000 4395320.00 Sales that were executed on December 24, 2025 are being reported on this Form 144 filed on December 29, 2025 given December 24, 2025 and December 26, 2025 were treated as federal holidays for EDGAR filing purposes. 12/29/2025 08/08/2025 /s/ Anne Lee Skates